Bottom closure for paper-bag machines



Y C. H. HARTMAN BOTTOM CLOSURE FOR PAPER BAG MACHINES Filed Jan. 23, 1924 2 Sheets-Sheet 1 A. c L H. m nu Dec. 29, 1925. 1,567,437

C. H. HARTMAN BOTTOM -CLOSURE'.FOR PAPER BAG MACHINES Filed Jan. 23, 1924 2 Sheets-Sheet 2 shown 01 Car/ Hf/artman.

indicated in position thereagainst.

Patented Dec. 29, 1925.

urrah s'rnras PATENT QFFICE.

CARL H. HARTMAN, F TOLEDO, DHIO, ASSIGNOR TO THE VALVE BAG COMPANY OF AMERICA, 0F TOLEDO, OHIO, A CORPORATION OF OHIO.

BOTTOM GLOSUBE FOR ,'E.AIPER-BAG MACHINES.

Application fil ed January 23, 1924. Serial No. 687,990.

To all whom it may concern:

Be it known that I, CARL H. HARTMAN, a citizen of the United States, and a resident of Toledo, in the county of Lucas and State of Ohio, have invented a new and useful Bottom Closure for Paper-Bag Machines,

which invention is fully set forth in the following specification.

My invention relates to paper-bag machines, and more particularly to bottom folders for such machines.

My invention has for its object to provide means for foldin the bottoms of bags in a simple manner W ich will effect such folding rapidly and with certainty.

One embodiment of my invention is shown in the accompanying drawings, in which Figure 1 is a section through the bottom-folding apparatus along the line 11 of Fig. 4, with many of the parts indicated diagrammatically; Figs. 2 and 3 are views of the bottom-folding means in successive positions; Fig. 4 is apartial plan view; Fig. 5 is a section on the line 55 of Fig. 4, and Figs. 6 and 7 are views of the folding segments. Fig. 8 is a diagrammatic view of a position between those of Figs. 2 and 3.

In the type of paper bag machine to which this invention relates, paper strips are fed continuously into the machine and folded into tubular form. Successive lengths are cut from the tube and successive sections are opened up at one end, creased and folded to form bottoms, thus completing the bags.

The portion of the apparatus to which this invention relates is the device for folding the flaps of the bottom to complete the bag-forming operation. A creasing roll 10 is shown diagrammatically with a big 11 operating creasing roll 12 carries creasing blades 13 and 14. These blades co-operate with grooves in the roll 10 to form creases in the bag bottom along the lines at which the forward flap 15 and the rear flap 16 of the bottom are folded. The successive bags are held in position against the roll 10 by tapes 17 These creasing rolls operate in a well-known manner and form no part of my invention.

A finger 18 is pivoted at 19 to an arm 20 of a rock shaft 21. The rock shaft 21 is operated by an arm 22, which is connected to a member 23 by pivot 24. The member 23 has its free end forked at 25 and the twoarms of the fork pass upon opposite sides of the shaft 26. A roller 27 mounted on the member 23 operates within a cam groove 28 in disc 29, which is operated in- 60 rearward flap towards the forward flap, as

indicated by the positions shown in Figs. 1 and 2.

A shaft is mounted beside the creasing roller 10 and carries a gear 41, in engagement with a gear moving in unison with the roller 10. The shaft 40 carries two segments 42, and the parts are so proportioned that these segments 42 have a surface speed substantially equal to that of the roller 10 and are so located that the following portions 43 of the segments contact the forward flap 15 and roll it down against the roller 10, as clearly indicated in Fig. 2. Two sleeves 44 surround the shaft 40, each sleeve carrying a segment 45 adjacent a segment 42. The sleeves aredriven at such a speed that they will rotate a multiple of the times which the shaft 40 rotates. I prefer the proportion to be three to one. The leading corner 46 of each segment 45 is beveled slightly, so that it will properly fold the following flap 16, as will be seen from Fig. 8. The segments 45 rotate with such speed that the following ends 47 press the flap 16 into position against the flap 15. A shaft 48 carries a gear 49, meshing with a gear on the end of creasing roll 10, and two sprocket chains 50 are driven by sprocket wheels 51 on shaft 48 and drive sprocket wheels 52 on sleeves 44.

Pulleys 53 are mounted on sleeves 44, and drive thetapes 17. A shaft 54 carries arms 55, which carry rollers 56, which hold the tapes 17 against the surface of roller 10. Tapes 58 passing around roller 10 and over roller 59 strip the bags from the creasing roller. Tapes 60 pass over roller 61, in contact with roller 59, between the final delivering rollers 62 and 63 and over the guide roller 64. Shaft 54 carries arms 65 which 16 are to be folded. The finger 18 moves the fiap 16 forward more rapidly than the bag is moving so that, by the time the parts reach the position shown in Fig.2, the flap 16 will project into the space between segments 42 and- 45. In the meantime, the forward flap has encountered segment 42 and will be folded down so that the flap 16 may be folded over it. The leading corner 46 of the rapidly moving segment then encounters the flap 16 and completes the folding operation, and the succeeding portions of the surfaces .of the segments hold the flap 16 down. in its folded position until it is delivered between the tapes 58 and 60,

[which carry off and deliver it from the machine. The tapes 17 cont-act the sides of the bag beyond the bottom flaps, and the crease 67, along which the flap 16 is folded, is. allowedto drop away from the creasing roll a slight distance, as shown. \Vhen the finger 18 pushes the flap 16 forward, the entire bending does not take place at the crease 67, but the paper adjacent that crease is bent to some extent, which causes the crease to move away from the roller.; There is some variation in the register of the bags with the segments and some variation in the distance crease 67 drops away from the creasing roller, but the bevel 46 is suflicient to insure that the segment will not enter behind crease 67, but willcontact the outer side of the flap and bring it into proper position.

This arrangement allows extremely rapid operation without danger of breaking the fiaps or scattering the paste, and so endangering the sealing operation. s

It has been previously proposed to fold the flaps by rotary segments.rotated at the same speed. With that arrangement, the forward flap is held down for a very short time and the rear flap has to be moved forward with such speed that there is danger of scattering the paste and even breaking the paper. Inthe improved construction shown herein, the segment contacting the leading flap moves at the same speed as the creasing roller and, therefore, holds this forward flap down for a considerable time and gives opportunity for a more gradual 'movement of the rear flap into position against the forward flap. The means for operating the finger l8 disclosed herein gives satisfactory results, but

may be varied as desired without affecting the operation of the segments, and any other suitable means may be substituted for folding the rear flap into po*ition where it will be operated uponthe folding segments.

Various changes in the shape and operation ofthe parts may be made within the scope of the appended claims without departing from the spirit of the invention.

What I claim is 1. In a paper bag machine, bottom-closing means comprising separate members for folding the two flaps,va shaft upon which said memebrs are mounted and driving connections for rotating said memebrs about said shaft, said connections being arranged torotate the rear valve-folding members.

ments are mounted, means for moving bag blanks past said segments, means for rotating the front flap-folding segment at substantially the surface speed of the bag; blank, and means for rotating the rear flap-folding segment a multiple of the number of times that the front flap folder is rotated.

3. In a paper-bag machine, bottom-closing means comprising a creasing roll, a shaft ad acent the creasing roll and carrying a segment adapted to contact the forward flap of a bag on the roll, means to drive the segment at a surface speed substantially equal to that of the roll, a sleeve surrounding the shaft and carrying a segment adapted to contact the rear flap and means to rotate the sleeve at a multiple of the speed of the front fiap folder.

4. In a paper-bag machine, bottom-closing means comprising a creasing roll, a shaft adyacent the creasing roll and carrying a segment adapted to contact the forward flap of a bag on the roll and means to drive the shaft so that the segment will have a surface speed substantially equal to that of the roll, sleeves surrounding the shaft on eachside of the segment, segments 'on the sleeves adapted to contact the rear flap, means for rotating the sleeves more rapidly than the shaft, tapes adapted to hold the bags against the roll, and pulleys on the sleeves of such size as to receive and drive the tapes at a speed substantially equal to that of the roll.

5. A, paper bag machine comprising a creasing roll and a rear flap-folding seg- CARL H. HARTMAN. 

